[INFO] cloning repository https://github.com/iomentum/twig-inliner
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iomentum/twig-inliner" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiomentum%2Ftwig-inliner", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiomentum%2Ftwig-inliner'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa989c248c85733b3a4d17cc9b4dca1026ed9446
[INFO] testing iomentum/twig-inliner against master#b03b3a7ec92682be2917540b679478d41c95a30c for pr-137122-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiomentum%2Ftwig-inliner" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/master': couldn't write '/workspace/builds/worker-2-tc1/source/.git/refs/heads/master.lock'


failed to checkout https://github.com/iomentum/twig-inliner

Caused by:
    command failed: exit status: 128